usr/dash/error.c

/*-
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1997-2005
 *	Herbert Xu <herbert@gondor.apana.org.au>.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Errors and exceptions.
 */

#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>

#include "shell.h"
#include "main.h"
#include "options.h"
#include "output.h"
#include "error.h"
#include "show.h"
#include "eval.h"
#include "parser.h"
#include "system.h"


/*
 * Code to handle exceptions in C.
 */

struct jmploc *handler;
int exception;
int suppressint;
volatile sig_atomic_t intpending;


static void exverror(int, const char *, va_list)
    __attribute__((__noreturn__));

/*
 * Called to raise an exception.  Since C doesn't include exceptions, we
 * just do a longjmp to the exception handler.  The type of exception is
 * stored in the global variable "exception".
 */

void
exraise(int e)
{
#ifdef DEBUG
	if (handler == NULL)
		abort();
#endif
	INTOFF;

	exception = e;
	longjmp(handler->loc, 1);
}


/*
 * Called from trap.c when a SIGINT is received.  (If the user specifies
 * that SIGINT is to be trapped or ignored using the trap builtin, then
 * this routine is not called.)  Suppressint is nonzero when interrupts
 * are held using the INTOFF macro.  (The test for iflag is just
 * defensive programming.)
 */

void
onint(void) {

	intpending = 0;
	sigclearmask();
	if (!(rootshell && iflag)) {
		signal(SIGINT, SIG_DFL);
		raise(SIGINT);
	}
	exraise(EXINT);
	/* NOTREACHED */
}

static void
exvwarning2(const char *msg, va_list ap)
{
	struct output *errs;
	const char *name;
	const char *fmt;

	errs = out2;
	name = arg0 ?: "sh";
	fmt = "%s: ";
	if (commandname) {
		name = commandname;
		fmt = "%s: %d: ";
	}
	outfmt(errs, fmt, name, startlinno);
	doformat(errs, msg, ap);
#if FLUSHERR
	outc('\n', errs);
#else
	outcslow('\n', errs);
#endif
}

#define exvwarning(a, b, c) exvwarning2(b, c)

/*
 * Exverror is called to raise the error exception.  If the second argument
 * is not NULL then error prints an error message using printf style
 * formatting.  It then raises the error exception.
 */
static void
exverror(int cond, const char *msg, va_list ap)
{
#ifdef DEBUG
	if (msg) {
		TRACE(("exverror(%d, \"", cond));
		TRACEV((msg, ap));
		TRACE(("\") pid=%d\n", getpid()));
	} else
		TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
	if (msg)
#endif
		exvwarning(-1, msg, ap);

	flushall();
	exraise(cond);
	/* NOTREACHED */
}


void
sh_error(const char *msg, ...)
{
	va_list ap;

	va_start(ap, msg);
	exverror(EXERROR, msg, ap);
	/* NOTREACHED */
	va_end(ap);
}


void
exerror(int cond, const char *msg, ...)
{
	va_list ap;

	va_start(ap, msg);
	exverror(cond, msg, ap);
	/* NOTREACHED */
	va_end(ap);
}

/*
 * error/warning routines for external builtins
 */

void
sh_warnx(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	exvwarning(-1, fmt, ap);
	va_end(ap);
}


/*
 * Return a string describing an error.  The returned string may be a
 * pointer to a static buffer that will be overwritten on the next call.
 * Action describes the operation that got the error.
 */

const char *
errmsg(int e, int action)
{
	if (e != ENOENT && e != ENOTDIR)
		return strerror(e);

	if (action & E_OPEN)
		return "No such file";
	else if (action & E_CREAT)
		return "Directory nonexistent";
	else
		return "not found";
}


#ifdef REALLY_SMALL
void
__inton() {
	if (--suppressint == 0 && intpending) {
		onint();
	}
}
#endif
1	/*-
2	* Copyright (c) 1991, 1993
3	* The Regents of the University of California. All rights reserved.
4	* Copyright (c) 1997-2005
5	* Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved.
6	*
7	* This code is derived from software contributed to Berkeley by
8	* Kenneth Almquist.
9	*
10	* Redistribution and use in source and binary forms, with or without
11	* modification, are permitted provided that the following conditions
12	* are met:
13	* 1. Redistributions of source code must retain the above copyright
14	* notice, this list of conditions and the following disclaimer.
15	* 2. Redistributions in binary form must reproduce the above copyright
16	* notice, this list of conditions and the following disclaimer in the
17	* documentation and/or other materials provided with the distribution.
18	* 3. Neither the name of the University nor the names of its contributors
19	* may be used to endorse or promote products derived from this software
20	* without specific prior written permission.
21	*
22	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32	* SUCH DAMAGE.
33	*/
34
35	/*
36	* Errors and exceptions.
37	*/
38
39	#include <signal.h>
40	#include <stdlib.h>
41	#include <string.h>
42	#include <unistd.h>
43	#include <stdio.h>
44	#include <string.h>
45
46	#include "shell.h"
47	#include "main.h"
48	#include "options.h"
49	#include "output.h"
50	#include "error.h"
51	#include "show.h"
52	#include "eval.h"
53	#include "parser.h"
54	#include "system.h"
55
56
57	/*
58	* Code to handle exceptions in C.
59	*/
60
61	struct jmploc *handler;
62	int exception;
63	int suppressint;
64	volatile sig_atomic_t intpending;
65
66
67	static void exverror(int, const char *, va_list)
68	__attribute__((__noreturn__));
69
70	/*
71	* Called to raise an exception. Since C doesn't include exceptions, we
72	* just do a longjmp to the exception handler. The type of exception is
73	* stored in the global variable "exception".
74	*/
75
76	void
77	exraise(int e)
78	{
79	#ifdef DEBUG
80	if (handler == NULL)
81	abort();
82	#endif
83	INTOFF;
84
85	exception = e;
86	longjmp(handler->loc, 1);
87	}
88
89
90	/*
91	* Called from trap.c when a SIGINT is received. (If the user specifies
92	* that SIGINT is to be trapped or ignored using the trap builtin, then
93	* this routine is not called.) Suppressint is nonzero when interrupts
94	* are held using the INTOFF macro. (The test for iflag is just
95	* defensive programming.)
96	*/
97
98	void
99	onint(void) {
100
101	intpending = 0;
102	sigclearmask();
103	if (!(rootshell && iflag)) {
104	signal(SIGINT, SIG_DFL);
105	raise(SIGINT);
106	}
107	exraise(EXINT);
108	/* NOTREACHED */
109	}
110
111	static void
112	exvwarning2(const char *msg, va_list ap)
113	{
114	struct output *errs;
115	const char *name;
116	const char *fmt;
117
118	errs = out2;
119	name = arg0 ?: "sh";
120	fmt = "%s: ";
121	if (commandname) {
122	name = commandname;
123	fmt = "%s: %d: ";
124	}
125	outfmt(errs, fmt, name, startlinno);
126	doformat(errs, msg, ap);
127	#if FLUSHERR
128	outc('\n', errs);
129	#else
130	outcslow('\n', errs);
131	#endif
132	}
133
134	#define exvwarning(a, b, c) exvwarning2(b, c)
135
136	/*
137	* Exverror is called to raise the error exception. If the second argument
138	* is not NULL then error prints an error message using printf style
139	* formatting. It then raises the error exception.
140	*/
141	static void
142	exverror(int cond, const char *msg, va_list ap)
143	{
144	#ifdef DEBUG
145	if (msg) {
146	TRACE(("exverror(%d, \"", cond));
147	TRACEV((msg, ap));
148	TRACE(("\") pid=%d\n", getpid()));
149	} else
150	TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
151	if (msg)
152	#endif
153	exvwarning(-1, msg, ap);
154
155	flushall();
156	exraise(cond);
157	/* NOTREACHED */
158	}
159
160
161	void
162	sh_error(const char *msg, ...)
163	{
164	va_list ap;
165
166	va_start(ap, msg);
167	exverror(EXERROR, msg, ap);
168	/* NOTREACHED */
169	va_end(ap);
170	}
171
172
173	void
174	exerror(int cond, const char *msg, ...)
175	{
176	va_list ap;
177
178	va_start(ap, msg);
179	exverror(cond, msg, ap);
180	/* NOTREACHED */
181	va_end(ap);
182	}
183
184	/*
185	* error/warning routines for external builtins
186	*/
187
188	void
189	sh_warnx(const char *fmt, ...)
190	{
191	va_list ap;
192
193	va_start(ap, fmt);
194	exvwarning(-1, fmt, ap);
195	va_end(ap);
196	}
197
198
199	/*
200	* Return a string describing an error. The returned string may be a
201	* pointer to a static buffer that will be overwritten on the next call.
202	* Action describes the operation that got the error.
203	*/
204
205	const char *
206	errmsg(int e, int action)
207	{
208	if (e != ENOENT && e != ENOTDIR)
209	return strerror(e);
210
211	if (action & E_OPEN)
212	return "No such file";
213	else if (action & E_CREAT)
214	return "Directory nonexistent";
215	else
216	return "not found";
217	}
218
219
220	#ifdef REALLY_SMALL
221	void
222	__inton() {
223	if (--suppressint == 0 && intpending) {
224	onint();
225	}
226	}
227	#endif